Compatibility: works well with PSE bows featuring 1/4" axles Construction Material: fiber based vinyl extremely slick and durable Sizes: .257" ID .500"OD Kit also includes 4 Made in USA Top Quality E-Clips for 1/4" axles 46 pieces Kit includes 6 of the following thickness shims: .020" .032" .040" .062" .075" .093" .125"